At first I thought someone had taken a regular doll head and stuck it on a troll doll some time in the 80s, but I showed it to my friend who is a doll expert and he is certain it's a Liddle Kiddle doll. According to Wikipedia they were only produced from 1965 until 1970 when they were discontinued due to the global oil crisis.

This one is in pretty rough shape, but here are some images of how they look in good condition: